Mixedness and entanglement for two-mode Gaussian states

OPTICS COMMUNICATIONS

卷:285

Article

Souza, L. A. M.¹  Drumond, R. C.²  Nemes, M. C.²  Fonseca Romero, K. M.³ 

[1] Univ Fed Vicosa, BR-35960000 Florestal, MG, Brazil

[2] Univ Fed Minas Gerais, Inst Ciencias Exatas, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil

[3] Univ Nacl Colombia, Fac Ciencias, Grp Opt & Informac Cuant, Dept Fis, Bogota 111321, Colombia

关键词: Gaussian states;    Decoherence;    Entanglement;   

DOI  :  10.1016/j.optcom.2012.07.004

来源: Elsevier

【 摘 要 】

We analytically exploit the two-mode Gaussian states nonunitary dynamics. We show that in the zero temperature limit, entanglement sudden death (ESD) will always occur for symmetric states (where initial single-mode compression is z(0)) provided that the two mode squeezing r(0) satisfies 0 < r(0) < 1/2 log(cosh(2z(0))). We also give the analytical expressions for the time of ESD. Finally, we show the relation between the single modes initial impurities and the initial entanglement, where we exhibit that the latter is suppressed by the former. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

Free